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Endocrine System
Descrição
To better understand what the Endocrine System does.
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endocrine
system
biology
science
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The Enlightened One
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Resumo de Recurso
Endocrine System
Major Glands
Pineal Body
Melatonin - sleep-wake cycle, seasonal rhythms, light conditions.
Pineal Body - Middle Area of the brain
Hypothalamus
Releasing, inhibiting hormones.affect the functions of the anterior pituitary gland.
Oxytocin and Vasopressin - transported to the posterior pituitary for temporary storage.
Hypothalamus - Lower Central Area of the brain
Pituitary Gland (Hypophysis)
Master Gland. Secretes a lot of hormones that influence other glands.
Pituitary - Beneath the Hypothalamus
Anterior Lobe
Somatropin, Thyroid Stimulating Hormone, FHS, Adrenocorticotropic, Lutenizing, Prolactin
Middle Lobe
Melanocyte-stimulating Hormone - stimulates release of Melatonin
Posterior Lobe
Secretes hormones released by the hypothalamus.
Oxytocin - regulates uterine contraction during childbirth.
Vasopressin - antidiuretic, prevents waterloss from the body.
Thyroid
Thyroxine and Triiodothyronine - work together to regulate the body's mental and physical growth
Calcitonin - Decreases blood calcium level
Parathyroid
Controls Ca within bones and blood.
Parathyroid - 4 structures wrapped around the Thyroid.
Thyroid - base of the neck, wrapped around the lateral side of the trachea.
Andrenal Glands
Glucocorticoids - increase of blood sugar and breakdown of proteins..
Mineral Corticoids - regulates concentration of sodium, calcium, and water balance in blood.
Androgens like testosterone - influence the development of male secondary sex characteristics.
Adrenal Cortex
Adrenal Cortex - Outer layer
Adrenal Glands - top of the kidneys
Adrenal Medulla
Adrenaline or Epinepherine or noradrenaline or norepinepherine - improves fight-or-flight response.
Adrenal Medulla - Inner Layer
Pancreas
Insulin - secreted by beta cells, lower blood sugar level.
Glucagon - produced by alpha cells, raises blood sugar level.
Islets of Langerhans
Testes
Angrogen Testosterone - controls growth and development of male sex organ and secondary sex characteristics.
Ovaries
Progesterone and Estrogen - stimulate growth of uterine lining
Estrogen also deals with secondary female characteristics.
Summary
Chemically controls body processes through its hormonal secretions.
Hormones are directly secreted by the ductless glands directly into the bloodstream.
Hormones are mostly made of proteins.
Some hormones affect most tissues of the body; some only have one or a few targets.
Some hormones affect other endocrine glands.
Hormones act in very small amounts. Therefore is very sensitive to changes, even in the slightest increase or decrease.
An increase or a decrease in normal hormone level indictes disorders with the endocrine system.
Some hormones have antagonistic effects. Meaning their function contrasts with another.
An example would be Insulin and Glucagon, which decreases and increases blood sugar, respectively.
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